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<head>
  <meta charset="UTF-8">
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  <title>Document</title>
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<body>
  <script>
    let arr = [5,2,4,6,9,8,2]
    function getEvenSum(a) {
      let sum =0
      for(let i = 0;i<a.length;i++){
        if(a[i] % 2===0){
          sum += a[i]
        }
      }
      return sum
    }
    console.log(getEvenSum(arr));
  </script>
</body>
</html>